Malicious PDF — malware analysis report

Static analysis result for SHA-256 83551ed538e2f9d0…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 15:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3006d0b8e798a7eabfb4aca473fe8d33 SHA-1: b73704ebc9592ddc945142e799f633b53d29daad SHA-256: 83551ed538e2f9d04fa1aae177764896912464e38e37d4bbcabdba6a55c26e24
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains numerous embedded URLs. One critical heuristic indicates the presence of a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=atharvashirsha+ganpati+marathi+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the sheer volume of links and the malicious redirector URL strongly suggest an attempt to lure users to malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=atharvashirsha+ganpati+marathi+pdf
    • http://files.mycdaclass-unit8.com/uploads/1/3/1/4/131453698/dekeganojenak_vuvibakexo_kopawajotis.pdf
    • http://files.laurawebber.com/uploads/1/3/0/8/130873992/7807e64062.pdf
    • http://files.neworleansfishingadventures.com/uploads/1/3/1/8/131856949/nuwoniluxe.pdf
    • http://files.futureomro.org/uploads/1/3/1/6/131607522/romuparedosum.pdf
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/gauss_jordan_method.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/sotivigonoxerepoxemewido.pdf
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/83448652636.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/9421869720.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jidaxuno.pdf
    • https://cdn.shopify.com/s/files/1/0437/8109/5581/files/the_hobbit_the_desolation_of_smaug_123movies.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/jogelanavipevisukifama.pdf
    • https://cdn.shopify.com/s/files/1/0429/4901/7756/files/81909790735.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/salesman_resume.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/english_reading_lessons_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/36416981887.pdf
    • https://cdn.shopify.com/s/files/1/0432/0906/4607/files/maplestory_demon_avenger.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006359.bin
5c4212ec26518d748839f71887c9e6b11489e1267c7e8cb2c5b3e5a6642dadaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6359 5472 bytes
font_01_sfnt_off000075d1.bin
65182d510808c646e59b7705918c373c4b85b70f717855614da372f2bf1d464b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D1 9864 bytes
font_02_sfnt_off000097dd.bin
7ac448c9080533aad7bbe37672b5251c5469e3db4ee9a023493941180876b067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DD 3560 bytes

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